I was playing on Blockland on a multiplayer server, but as soon as this guy joined (I forgot the name), it had a runtime error. This has happened to me on several occasions, including when I was doing a Renderman Hunt. If anyone knows why this happens, please tell me. Also, I have a very old graphics card, (OpenGL 1.0), so if any of you guys know, please notify me on this post.
My OS: Windows Vista, Service Pack 1 with OpenGL 1.0. PC was built for Windows Vista, and an Intel Pentium D.